I cant remember what country it was either Sweden or Switzerland require their homes to have a full 1 year supply of food in their homes and this is actually audited by some official that comes to your home to check that you have the necessary provisions.
Reason being in a time of crisis or need the people of the country can fend for themselves and the government can get on with the tasks at hand. WOW a government with logic!! Who would have thought of that!!
As HellTick said you may stock some nice foods because you don't want to be sitting in the dark eating boiled rice.
I went to this food whole sale supermarket :
HERE
And I managed to get catering soup mixes $25 AUD and you get 140 serves of soup ... it doesn't have to be made all at once you can mix it up as you need .... and all you need is hot water ... now that's a cheap investment for an easy meal, needless to say I bought 3 different varieties 420 serves.. not bad for $75 bucks in total